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Yes, this is true. Its not the lack of the heat-sink, it is the lack of the fan which sits on top of the heat-sink that stops the computer powering up.
P4 CPUs will shut of automatically if they reach a predetermined temperature which they will do very quickly without a heat-sink and fan.
The BIOS monitors the heat-sink fan speed and shuts down if there is no fan or the fan stops to prevent damage to the CPU.
Powering up a modern computer without a heat-sink and fan is suicidal. Its like taking your car for a test spin before you have connected the radiator and cooling system.
Stuart
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"Powering up a modern computer without a heat-sink and fan is suicidal."
Good point Stuart...an AMD will fry in a matter of seconds.
Just had to say it twice for those who don't read user manuals.
Skip
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Isn't the motherboard detect the heatsink is seated on top or not?
Does the motherboard detected by the fans or the thermal grease because one of my friends' computer need to put the heatsink down the cpu before the computer starts. He tried to take it out, and the computer would not start at all
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Hey Tommycoolman, would you like some A-1 sauce with that?
I may be crazy, but I'm not stupid...
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>> Isn't the motherboard detect the heatsink is seated on top or not? <<
I have never seen a motherboard with any electrical contact between the heat-sink and the motherboard - but there is between fan and motherboard.
The CPU is probably shutting down because it is overheating, fast, in seconds. Don't do it, you are tempting providence.
Stuart
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"I have never seen a motherboard with any electrical contact between the heat-sink and the motherboard..."
I have an Asus K7M mobo Slot A w/ an Athlon 600 CPU. There is a cable/sensor (accessory, P2T-Cable) which sticks on the heatsink and connects to a two pin thermal connector on the mobo.
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Dan,
That is a temp probe. It still doesn't tell the system of the physical presents of a heat sink assembley. You could attach that probe to the cpu chip with out a heat sink and it would be happy. For about 4 seconds...
To my knowlage there is not a motherboard currently being made that can tell if the heat sink has been installed.
Two methods come to mind however but would require re-enginneering the motherboard. One would be a micro switch on the board that would be pressed down when the overhang of the heat sink is pressed down on it. Another would be to make the heat sink a part of a circuit. With the heat sink in place the circuit would be complete and the system would then check for the presents of a cpu fan tach signal. All good, boot up.
But right now the makers of cpu chips and motherboards are relying on people not being dumb enough to try to run with out a heat sink/cpu fan.I may be crazy, but I'm not stupid...
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OK, sorry, I misread (or took too literally) the post I replied to. Tired these days, packing to move, yech.
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